an open and shut case 明显的事件；一个一目了然的案子

【例句】
There were many things that made us end our relationship; it was not an open and shut case.
我们分手的原因很多，这不是容易说得清的事情。

She's the only applicant for the job, so she's bound to be appointed-it's an open and shut case.
她是唯一申请那份工作的人，因此她必定会被录用这是一目了然的事情。